QLabel as an item delegate

Hi,

I need to create an item delegate that shows the item data using a QLabel instead than a QEdit (the standard delegator for text data). The label need to show text (item value for example) in underline and blue and also show a different mouse pointer. See this image for example:

http://www.qlands.com/other_files/view.jpg

I can create a label that is blue, underline and has a different mouse pointer... But what do I need to do to use it in the delegate? I tried to follow the starDelegate example but I got lost in the paint().

Thanks for the help.

Carlos.

There is no such thing as "QEdit". The standard delegate draws everything by itself. If you want to use QLabel then you can use QAbstractItemView::setIndexWidget() but it is not advised since it has nothing to do with your model. It's better to implement a proper delegate, draw the text using QPainter::drawText() and handle events for cursor changes.

ok.

How can I handle the event for cursor changes? In the mouseEnter(), mouseLeave() of the delegator()?

Thanks.

In editorEvent()

Brilliant!

I guess I also need to reimplement sizeHint() ... How can I produce a value to return?

Maybe by giving the size of a normal QLabel holding the value:

Code:

---

QSize labelDelegate::sizeHint(const QStyleOptionViewItem &option,
               const QModelIndex &index) const
{
    QLabel tlabel;
    tlabel.setText(index.data().toString());
    return tlabel.size();
}

---

QFontMetrics

Yep.

I got that working after all.

Now the problem that I have is with the events enter and leave. Because editorEvent does not seem to receive such events from the view..

Here is the post:
http://www.qtcentre.org/threads/4383...er-leave-event

Thanks in advance.
Carlos.

Mouse tracking needs to be enabled for the view's viewport to receive such events, if I remember correctly.

Yes, I did enabled, thus I get mouse move but not enter/leave

Show your code.

Here is is:

labeldelegate.h

Code:

---

class labelDelegate : public QStyledItemDelegate
{
    Q_OBJECT
public:
    ...
    bool editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &option, const QModelIndex &index);
 
...
 
};

---

labeldelegate.cpp

Code:

---

bool labelDelegate::editorEvent(QEvent *event, QAbstractItemModel *model, const QStyleOptionViewItem &, const QModelIndex &index)
{
    if (event->type() == QEvent::MouseButtonDblClick)
    {
       qDebug() << "TMouseButtonDblClick works fine";
 
        return true;
    }
    if (event->type() == QEvent::Enter) //Does not work
    {
        qDebug() << "Enter";
        QCursor cursor(Qt::PointingHandCursor);
        QApplication::setOverrideCursor(cursor);
        return true;
    }
    if (event->type() == QEvent::Leave)  //Does not work.
    {
        qDebug() << "Leave";
        QCursor cursor(Qt::ArrowCursor);
        QApplication::setOverrideCursor(cursor);
        return true;
    }
    return false;
}

---

Many thanks

You may use QTableWidget and use setCellWidget to set a widget to cells of QTableWidget.

Hi,

As it is discussed before setCellWidget is not advised since it has nothing to do with the model.

Carlos.

Since the editorEvent() for the events you want is not called, providing code for editorEvent() is pointless :) Try providing a minimal compilable example reproducing the problem. The most interesting part is how you prepare the view widget.